Corrective device for secondary clock mechanism



Aug. 7, 192s,

A.. E. LONG CORRECTIVE DEVICE FOR SECONDARY CLOCK MECHANISM S'Shee'cs-Sheet l Filed Aug. 29, 1925 Aug. 7, 1928. 1,679,534

' A. E. LONG CORRECTIVE DEVICE FOR SECONDARY CLOCK MECHANISM Filed Aug. 29, 1925 A :s sheets-sheet 2 Ag. 7, 192s. 1,679,534

A. E. LONG CORRECTIVE DEVICE FOR SECONDARY CLOCK MECHANISM Filed Aug. 29, 1925 3 Sheets-Sheet 3 5.scription and claims.

In the drawings, in which niyinventiOn--is-- Pilier-ned Ali-ig. 7, 1928,

- :UNITED vs'rii'iiis PATENT. oF

ALBERT n. LONG, or CHICAGO, ILLINOIS, assIeNOn 'ro srnonnnne ELECTRIC confL PANY OF CHICAGO, ILLINOIS, A. CORPORATION OF COnnnC'rIvE DEVICE FOB. SECONDARY CLOCK meenemen.

appiicatin' inea Auguri 2s,- 1925. lsei-iai iro. 53,282.

' My invention relates to. corrective device for secondary clock mechanism.

One of the objects of my invention is to provide an improved corrective device which 'can readily be applied to existing types 0fsccondary clock systems.

A further object of my invention is to provide a corrective device which will be simple and reliable.

A further ob'ect of my invention is toproJ' y.the relay 8.. vHowever,

vide a corrective device in which the correo'- tive arrangement is controlled by the Wind-A f cuit as the secondary impulse" mechanism) ing magnet of the master clock. l

Further objects will appear f iomthe de-v shown,

Fig.. 1 is a somewhat diagrammatic view showing the master clock in some detail and showing diagrammatically the relay, secondary` mechanism and wiring arrangement;

ig. 2 is a view of the master clock meclianisin from the right of Fig.' 1;

Eig. 3 is a View of the circuit controlling l'lfldlauy rcwound as. the winding magnet switch controlled by the winding magnet;

Fig. 4 is a section on the line 4--4 of' 1*`i} 1r.1;and Fig. 5 is a'section on the line 5-5 of Fig. 1.

'Ihe construction vshown in thel drawing #comprises in a general waysecoiida tro-magnetic impulse mechanism suc as a secondary clock 1 or a recorder 2 and a masb the same-impulses. as said vsecOiidajry 4- idiechanism) a switch' Scent-rolled ".by the y magnetA for causing disconnection ter clockmechanism for controlling the secondary mechanism having a time `controlled instance if the secondary 'mechanism' ails to respond.) electromagnet 'impulsegmechanism 5 for winding the masterclock(controlled winding" o of theA w frequency switch and connection -of the high frequency: switch upon-'failure'. of the winding' magnet and' secondary mech-f anisiri to respond,` whereby when-the iin-,4

pulses again become jeifective to cai'ise-lref-l sponse lof vthe secondary mechanism and- I winding magnet 7, thewinding mechanism -will be advanced rapidly bythe high frcquency impulses, and means wherebyv the high frequency switch will be automatically to be transmitted In the Ordinary operation of the device the minute contact 'device 3 closes the circuit once per minute-and this causes an impulse to the electro-ma the secondary mechanism 1 and 2 t rou h if for any reason ti .winding magnet 7 which is the saine cirfails to res ond, the selective switch 6 is (perated to isconnect the minute contact vice 3 from the relay'circuit and connects device 4 in 'place thereof.

the second .Contact The selective switch' 6 staysin this'posi-tion in which the second contact device is in position to 'control the relay mechanism) so -'long as the secondary mechanism and winding magnet 7 fail to respond to the impulse. Duringthis period the Ymain spring 9 of the master clock is running down and is vnot peifi inactive. However, as soon as normal conditions are restored so that the secondary mechanism and windin magnet become responsive, the secon ary magnets and winding magnet are used to under the high frequency impulses. o

et ofoperat'e rapidly.` the.4

Fica.

vdisconnected and the low frequency switch second contact device 4 and'this rapid actu A ation continues until the secondary' mechfbroughtback to normal, w ereupon the se? lectivo switch 6 vis caused to Operate, connect. the minute contact-device 3 nisms and tlie-winding-manet 7 havebeen to again rice, and second contact'. device will.v be deydirectly controlled b selective'switch 6 is. i a pin 10 oiialdisk 11.

wah the relay 8 and ,.disconnect'-the second contact' scribed more in detail '-hereina'f'terlf g Thel A' mechanism bywhichthe winding. magnet 7,' i controls'theselective switchwillrst be de,- scribed 'in' detail.` The which is securedfto t ehub 12 tOi-whichone end ofthe main -sprmg9 is secured. This pin 10 cooperates with the-lower end of the switch lever 13 and vv cfhenfthe pin'- 10 is in its normal position, holds the switch lever 13 ni I position to connect the minute contact device 3 with the relay. When, for any reason, the

winding magnet fails to respond to the irripulses, the pin moves downwardly away rom engagement with this switch arm and permits the tension spring 14 to pull the switch arm 13 over, to disconnect the minute contact device 3 and connect the second con.- tact device 4. When the winding magnet 7 again becomes responsive to the impulses, the pin 10 is quickly brought back to its normal position by the high-frequency impulses and in this movement it engages the slanting cam edge of the bottom of the switch lever 13 and operates theswitch lever back so that the minute contact device 3 is again connected and the second contact device 4 is disconnected.

I will now describe the transmission from the main spring to the escapement of the master clock' mechanism and the transmission from t-he winding magnet to the main spring. The transmission from the winding magnet to the main spring comprises an arm 16 which oscilla-tes with the armature 17 of the magnet, a pair' of links 18 pivoted to this arm at 19, a friction pawl 2O pivoted to these links at 21, a pair of similar arms 22 mounted to oscillate about the axis of the shaft 23, to which arms the friction pawl 2O is pivotally connected at 24, and a friction disk or ratchet wheel 25 engaged by the friction pawl and secured to the hub 12 to which one end of the main spring is secured. rl`he other end of the main spring is fixed to a pin 26 mounted on, the frame-work. The construction has to be such that the friction awl 20 will engage the edge of the friction isk on a downward pull on the links 18 and such that the friction pawl will disengage and swing away from the friction disk 2() on the upward movement of the links. In order to accomplish this, a stop pin 27 is provided to limit the upward movement of the ,oscillatory arms 22, so that as the spring 28 returns the arm 16 and the spring 29 lifts the oscillatory arms 22, the edges of these arms will engage the stop pin 27 before the end of the movement of the armature and links 18 so that further movement of the armature and links will throw the edge of the friction pawl 20 away from the edge of the friction disk 25 to permit clock-controlled movement of the friction disk, as hereinafter g described.

The transmission from the main spring 9 tothe escapement wheel 30 comprises'the hub 12 previously referred to, to which the inner end of the main spring-9 is secured, a

take-up or driving ratchet wheel 31 secured to this hub, a takenup pawl 32 engaging this ratchet wheel 31, a holding ratchet 33 on which this take-up pawl 32 is pivoted, a holding pawl 34 engaging the holding ratchet 33, a yielding transmission spring 35 wra ped around the' hub 36 on which the hol ing' ratchet 33 is mounted and having one end secured to the holding ratchet wheel,

a spur gear 37 to which the other end vof this yielding transmission spring 35 is connected, mounted on a hub 38 secured to the shaft 23 on which oneof` the clock hands may be mounted, a pin 39 secured to the spur gear 37, and having one end lying in a slot 40 in the holding ratchet wheel 33, a pinion 4l meshing with the spur gear 37, a shaft 42 on which the pinion 41 is mounted, a spur gear 43 mounted on this shaft 42, and a pinion 44 meshing with this spur gear 43, this pinion 44 being mounted on the shaft 45 on which the escapement wheel 3() which coo-perates with the verge 46 is mounted.

As-will be pointed out more fully hereinafter, the periodic operation ofthe winding magnet 7 momentarily prevents the main spring 9 from being effective to cause pressure to be transmitted to the escapeinent wheel 30. It is in order to take care of this momentary interruption-of the power of the main spring that the yielding spring and lost motion connection between the holding ratchet wheel 33 and the spur gear'37 are provided. During the greater period of operation, the spur gear 37 is driven directly from the holding ratchet wheel through the pin 39 engaging the rear edge of the slot 40 in the holding ratchet wheel 33. However, when for a moment the friction pawl 2O is acting to turn the friction disk 25, the tooth of the take-up ratchet wheel 31 which was engaged by the take-up pawl l32 is moved away from this pawl and the holding ratchet wheel is held against following after this take-up ratchet, by means of the holding pawl 34. While the holding ratchet wheel is thus held, pressure is exerted on the escapement wheel 30 through the yielding transmission spring 35, the pin and slot engagement 39 and 40 permitting the requisite relative motion of the spur gear 37 with respect to the holding ratchet wheel 33. Vhen the winding magnet is deenergized, and the link again moved upwardly, another tooth of the take-up or driving ratchet 31 engages the take-up pawl 32 and the main spring 9 again becomes effective througlr the trans-- lli' and- 48 are provided, onefmounted Y the main l spring can run down in theevent, that' hef winding magnet Vbecomes ineffective, this" running down movement being limited to a' single revolution of the disk, as attheend of the revolution, the back-side'of ,the mov-f able pin 48 will engage the back'f'side of' the fixed pin 47 and prevent furtheralnwinding of the main spring. *Y

In the ordinary operation of the-masteriao clockwhen controlled by the minute contact device, the winding magnet 7 is energized once per minute and from this it results that the friction disk oscillates back and forth one-sixtieth of a revolution in each direction. lt moves slowly in a clockwise direction to move the semi-cylindrical pin 48 away from the fixed semi-cylindrical pin 47 during the escapement controlled movement of the friction disk and it is moved quickly back to ,bring the movable stop pin 48 against the fixed stop pin 47 upon the energizat-ion of the electromagnet. This quick magnet controlled movement of the friction disk 25 also causes a corresponding retrograde movement of the take-up ratchet wheels 31 and brings a fresh tooth of this take-up ratchet wheel into engagement with the take-up pawl 32 Vmounted on the holding ratchet wheel 33. The main spring is thus kept wound up by the periodic energization of the winding magnet. The oscillatory movement of the take-up or driving ratchet wheel 31 causes unidirectional rotation of 25` the holding ratchet wheel 33 and this uni# Y an understanding of t is invention.

directional rotation is transmitted through the yielding transmission and gear train previously described, to the esca-peinent wheel 30 which cooperates with the verge 46.

Aspreviously pointed out, when the secondary mechanisms and winding magnet 7 are functioning normally, the switch controlling pin 10 is in engagement with the lower end of the switch arm 13, and the minute contact device 3 is connected with the relay mechanism, but when the winding magnet fails to respond, the main spring 9 iinwinds and is not rewound and the switch controlling p-in 10 moves away from the switch, permitting the spring 14 to throw the switch arm into position to disconnect the minute contact device 3 and connect the second contact device l4.A While the details of the minute contact switch and second Contact switch are not claimed in this application, a brief descri tion is necessary to The minute contact switch comprises a pair of contacts49 and 50 for controlling the relay .circuit so arranged that when the control arms 51 and`52 are momentarily'separated, once each minute by the action oli-the spiral cam 53, a circuit will be completed through the relay 8 which will cause a' momentary impulse to be transmitted to the secondary apparatus and to the winding magnet 7. To laccomplish this the shorter cont-rolling arm 51 has mounted thereon the contact 49 electrically `connected with the binding screw 54 which drops down onto the Contact 50 on the longer controlling arm 52, which contact 50 is electrically connected with the other binding screw 55. When the shorter arm 51 drops oil' from the raised rtion of the cam 53 as shown in Fig. 1, the) contact 52 also drops off from the raised portion ofA the cam 53, and the contact 50 carried there by drops away from thev contact 49 carried by the shorter arm, and the relay circuit is broken. Y y

.The second Contact device comprises a spring finger 56 extending upwardly from lthe oscillatable verge shaft 57, two pairs of spring contact fingers 58, 58a, 58b and 58c controlled by said spring finger 56, and a pair of binding screws 59 and 60 connected to the wires and 76, respectively, leading to the relay. The two outside spring contacts 58 and 58`1I are connected by a conducting strap 63. In the construction shown, the circuit is completed when the spring linger 56 is moved tothe left as shown in F ig. l. 'Ihe .spring contact 58 is connected with the binding screw 59 and the spring contact 58c is connected with thev binding screw 60. The spring contact 58 is connected with the spring Contact 58c by means of the conductor strap 63. Thecircuit is from the screw 59, through the contacts 58 and- 58 and strap 63 to the bracket 64 into which the'screw 60 isvthreaded. In the arrangement shown the circuit is completed only on the left hand swing of the swing linger, but if it'should. b e desired to have a contact made on the right hand swing also, this could be accomplished. bv providing another conductor strap similar to the conductor strap 63 electrically connecting the inside cont-acts 58 and 58". This would of c'oure double the frequency of the contact device. rlhe spring linger 56 oscillates with the verge shaft 57 and consequently closes the circuit once per second. There are thus provided two selectively usable impulse controlling contact devices, one of which causes minute impulse, and the other oit-which causes second iinica pulses. The minute impulse contact device is the one which is in use norm-ally, the second impulse Contact device being brought into use only under abnormal conditions in which the secondary contact devices and winding magnet have failed to respond. As i previously stated, the selective switch 6 controlled by the winding mechanism determines which one of the two Contact devices is effective. The two Contact devices 3 and 4 are connected in parallel between the ter-4 lectivc switch 6 and the switch blade 70 of the selective switch is connected with the binding terminal 66 of the relay by means of a. conductor 71. When the selective switch is in a position shown in Fig. 1 the relay circuit is from the relay terminal through the conductor 67, minute contact switch 8, c onductor 72, selective switch contact 73, switch blade andconductor 71 to the other relay terminal 66. Vhen the selective switch arm moves from a position shown .in Fig. 1 to bring the switch blade 70 into engagement with the right hand switch contact 74, the

relay circuit is from the relay wiring ter-y minal 65 throughl the conductors 67 and 75,

' second contact device 4, conductorl 76, se-

lective switchv contactA 74, switchl blade 70 and conductor 71 to the other relay termif nal 66.

-The .relay land secondary mechanism may be of any usual or suitable construction, and are not disclosed in detail. In the arrangement shown the relay magnet coils 77 and78 are provided withan armature 79 which operates a contact member 8() to move it into enga-gement with another contact member 81 to close the circuit for the secondary apparatus and winding magnet, which are connected in parallel with the wires 82 and 83 ondary apparatus, to the other secondary line w'ire 82 and back to'the other' current supply.

wire 86. It will be seen that I have thus provided a master clock" mechanism for controlling secondary appara-tus having a simple and reliable corrective device for bringing the secondary a paratus back into synchronism if it has fai ed torespond to the impulses, and more specifically that I have provided such a corrective device which comprises a norma-lly operative low frequency periodic contact device and a high frequency periodic 'contact device which isr substituted in -the circuit for the low frequency device as soon as the secondaryapparatus fails to respond, and that the-connection of the two controlling contact devices in the circuit is controlled by the winding magnet for the master clock which is in parallel with the sec# ondary apparatus. i

While I have shown but one form of my invention, it is to be understood that I do not desire to limit myself to this particular construction since many changes and modificaary aptions may be made therein without departure from the scope of the following claims.

I claim:

1. The combination with a secondary electromagnetic impulse mechanism of a master clock for controlling said impulse mechapulses as said secondary mechanism, and

means controlled by the winding magnet for causing disconnection of the low frequency switch and connection of the high frequency switch'upon failure of the winding magnet to respond to the low frequency impulses.

2. lhe combination with a secondary electromagnetic impulse mechanism of a master clock for controlling said impulse mechanism having a periodic low frequency switch for normally controlling the impulses and a periodic high frequency switch for occasionally controlling the impulses, electromagnetic impulse mechanism for Winding the master clock, controlled by the same impulses as` said secondary mechanism, and means controlled by the winding magnet for causing disconnection of the low frequency switch and connection vof vthe high frequency switch upon failure of the winding magnet to respond to the low frequency impulses, said means comprising a member whose movement in one direction is controlled by the escapement of the master clock `and Whose movement in another direction is conthe master clock, controlled by the same impulses as said secondary mechanism, and

means controlled by the winding magnet 4for causing disconnection -of the low frequency switch and rconnection of the high frequency switch upon failure of the winding m'a net to respondto the low frequency imp ses, f

and whereby when the impulses again become effective to cause response of th sec. ondary impulse mechanism, the winding ,mechanism will be advanced rapidly by the high frequency impulses, and whereby the high frequency switch will be automatica-ll disconnected and the low frequency switc again -connected when the secondary impulse mechanism has been advanced into Synchromsm.

4. The combination with a secondary electromagnetic impulse mechanism of a master iso - clock for controllin said impulse mechanism having a peri ic low frequency switch for normally controlling the impulses and a periodic hi rh frequency switch for occasionally contro ing the impulses, electromagnetic impulse mechanism for winding vthe master clock,` controlled by the same impulses as said secondary mechanism and means controlled by the winding magnet for causing disconnection of the low frequency switch and connection of the high frequency switch upon failure of the winding mao'net to respond to the low frequency impulses, and whereby when the impulses again become effective to cause response of the sec ondary impulse mechanism, the winding lmechanism will be advanced rapidly by the l-high frequency-impulses, and whereby the high frequency switch will be automatically disconnected and the low frequency switch again connectedwhen the secondary impulsemechanism has been advanced into synchronism, said means comprising a member whose movement in'one direction is controlled b the escapement of the master clock, an whose movement in another direction is controlled by the winding magnet.

5. The combination with a secondary electromagnetic impulse mechanism of a master clockfor controlling said impulse mechanism having a periodic low frequenc switch for normally controlling the impu es and.

I erted on the escapement during a periodic high frequency switch for occasionally controlling the impulses, electromagnetic impulse mechanism for winding the master clock, controlled by the same impulses as said secondarypmechanism, and means controlled by the Winding magnet for causing disconnection ofthe low frequency switch and connection of the high frequency switch upon failure of the winding magnet to respond to the low frequenc impulses, said master clock having a coil torsion spring for driving it, having one end fixed and one end movable, said means comprising an oscillatable member whose movement in one directionis effected by the`movable end of the coil 'spring and controlled by the escapement of the master clock and whose movement in the opposite direction is controlled by the winding magnet, and a. rotatable member having a ratchet and pawl connection with said oscillatable member, whereby oscillation of said oscillatable member will cause step by step `rotation of said rotatable member, and a yielding transmission between said rotatable member and the escapement, whereby pressure will be exthe 'magnet controlled movement of the oscillatable member. i

In witness whereof, I have hereunto subscribed my'name.

ALBERr LONG. 

